Hey I was there in 2wd at york last saturday which car were you racing?
What profile settings have you got on your lrp speedo set to at current (throttle, initial brake, drag brake etc) ?
Theres no reason why you can't be just as fast as anyone else with this speedo its more than capable, also what transmitter are you using? Nothing wrong with stick transmitters
getting the corners right does take practice to get perfect...